Keyless socket.



C. D. PLATT.

KEYLESS SOCKET.

APPLICATION FILED OGT.22,1908.

Patented Nov. 30, 1909.

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UNITED STAT ESP1 X IENT OFFICE.

CLARENCE D. PLATT, 0F BRIDGEPORT, CONNECTICUT.

KEYLESS SOCKET.

airs-11.

[u all whom "it may concern:

Be it known that I, CLARENCE D. PLATT, a;citizen of the United States,residing at Bridgeport, county of Fail-field, State of Connecticut, haveinvented a new and useful Keyless Socket, of which the following is aspecification.

This invention relates to the class of electrical sockets known to thetrade as keyless sockets, that is sockets in which no switch mechanismis embodied in the structure, the current throu h the lamp beingcontrolled by a group switch, and the invention has for its objects ,toimprove the details of cone struction and perfect the insulation of theparts and to simplify and cheapen' the construction by reducing thenumber of parts and using only parts that can be easily produced.

A special detail of construction is that of the insulating bodyorblockwhich is made of such form that it can be fashioned in a simple mold, byone compression of the porcelain mass when in plastic condition, bycoacting dies. And a special object relating to the insulation is toisosecure the parts bya simple rivet that they can not possibly becomemisplaced and cause a short circuit, and so that the correct assemblingpfbthe parts may be performed by unskilled a or.

With these and other objects in view I have devised the novel keylesssocket of which the following description in connection with theaccompanying drawing is a specification, reference characters being usedto indicate the several parts.

Figure 1 is a vertical section of my novel socket complete; Fig. 2 asection of a shell on the line 22 iii Fig. 1, looking in the directionof the arrows, the outer insulating washer and the contact springappearing in inverted plan; and Fig. 3 isa section on an enlarged scaleon the line 3-3 in Fig. 2.

1O denotes an insulating body which is provided in one side with arecess 11 to receive one of the terminals, indicated by 12, and intheopposite side with a recess 13 to receive the other terminal which isindicated by 14. Terminal 14: is provided with a downwardly and inwardlyextendin arm 15 which is provided at its lower end with a head 16 lyingin the horizontal plane and having a hole through it.

17 denotes an internal recess in the body which communicates withrecess13 and ,is

Specification of Letters Patent.

Application filed October 22, 1908.

Patented Nov. 30, 1909.

Serial No. 459,058.

made large enough to permit the convenient insertion of arm 15 and thehead.

The body or block 10 is formed of one piece and the side recesses 11 and13 extend to the upper end of the body so that when said body is formedof plastic porcelain in a simple mold comprising a casing and up-' perand lower die members, the said recesses 11 and 13 may be formed by twoprojections of the upper die member which projections may be readilywithdrawn by an upward movement preparatory to removing the molded massto be baked. The recess 17 extends from the lower face of the block and,as will readily be seen in Fig. 1, is of such shape and location that itcan be formed by an upward projection from the lower die member, whichprojection can be/ readily withdrawn. or from which projection themolded mass can be readily removed. The holes for the screws hereinafterreferred to can be formed by pins projecting from either die member,preferably the lower one. The projection from the die which forms therecess 17 will have, of

course, in practice, a side which will slidinfact nothing but thesimplest kind of a single molding operation preceding the baking.

18 denotes circuit wires which are connected to. binding screws 19engaging the terminals.

' 20 denotes the screw shell whose base is provided with an external deression indicated by 21 to receive an insu atlng washer indicated by 22and with an internal depression indicated by 23 to receive antinsulating washer indicated by 24, the base of the screw shell lyingbetween said washers.

25 denotes a contact spring for engagement by a lamp base. I preferablyform this contact spring from a/disk of metal in which I make a circularcut 26 leaving the central portion of the disk, indicated by 27,

connected to the outer ring by a neck 28,the u The central portion ofthe contact spring leavethe screw shell perfectly insulated edge of theouter ring opposite to the neck being sprung out of the plane of thecentral portion, as-elearly shown in Figs. 1 and 3.

lies contiguous to insulating washer 24, and head 16 upon arm 15 liescontiguous to insulating washer 22.

The insulating washers, and head 16 (and with itsecur'd tothebase of theshell by means of an eyelet or-tubular rivet 29 which passes throughsaid parts and is headed down upon the central portion of the spring andthe head, as elearly shown in' Fig. 3. It should be noted that the baseof the screw shell is provided with a central hole 30 of greaterdiameter than the rivet or eyelet so as to the contact spring terminal14) are from the contact spring, eyelet and head which are of oppositepolarity. As the man ginal portions of the insulating washers 22 and 24so engage the shoulders resulting from forming the depressions 21 and 23that said washers can not possibly shift laterally after being connectedby the rivet 29, and as thehole 30 is of sufficiently larger diameterthan the said rivet to prevent'any short-circuit between said rivet andthe screw shell 20, the insulation of these parts remains perfeet underall conditions of handling and use. This is of especial advantage when aWire 18 is being connected tothe arm. 15 by the screw 19, because sincesaid arm is supported by the head 16 which, in turn, is localized by therivet 29, theact of making the connection might result in so shiftingtherivet asto permit contact thereof with the side of hole 30 if said rivetwere not firmly held by the washers which, in turn, are held centrallyby means of their marginal bearings as described. Unskilled labor cannot assemble the parts incorrectly because the depressions in the screwshell determine the location of the washers, the washers determine thelocation'of the rivet, and the rivet, in connection with therecesses 17and 13, determine the proper placing of the arm 15 and its head It}.

Terminal 14 requires no other support than theinsulated attachment ofthe head to the screw shell. Terminal 12 is secured in place by means ofa screw 31 which also serves as a means of attachment of the screw shellto the insulating body. The other screws, indicated by 32, by which thescrew 1 shell is secured to the-body, pass through the bodylongitudinally and engage nuts (not shown).

lVhen a lamp base (not shown) is turned into the screw shell, the centercontact of the lamp base engages contact spring 25. The

passage of the current is from terminal 12 through screw 31 to the screwshell and returning through the lamp base, contact spring, eyelet, headand arm 15 to terminal 14L.

Having thus described my invention, I

claim:

1. An insulating body having one of its .ends formed with side recessesextending to the end surface, and having an internal recess extendingfrom its other end to one of the side recesses.

4. An insulating body having one of its ends formed with side recessesextending to the end surface, and having an internal re- 'CQSS extendingfrom its other end to one of the side recesses, and having walls of thebody material between the side recesses and the opposite end of thebody, and formed with screw holes passing through the body for thepurpose'specified.

3. The combination with a screw shell having its base provided with ahole and with shoulders, of insulating washers engaging said shouldersand having holes in a linement with the hole of the serewshell, c011-tacts above and below said washers, and a rivet'connecting said contactsand passing through said holes, an annular space being formed betweensaid rivet and the edge of the hole in the screw shell.

4. The combination with a screw shell having its base provided with ahole and with shoulders, of insulating washers engaging said shouldersand having holes in alinement with the hole of the screw shell, a.contact bearing against one washer, a head bear: ing against the otherwasher and having an arm and a terminal, and a rivet connecting 100 saidhead and contact and passing through the holes of the shell and washers,an annular space being'formed between said rivet and the edge of thehole in the screw shell.

In testimony whereof I aflix my signature, 105

in presence of two witnesses.

' CLARENCE D. PLATT. lVitnesses:

A. M. l voos'rnn, S. W. ri'rninn'roN.

